linux-kernel - Re: [PATCH 3/7] gnss: add generic serial driver

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Date:   Wed, 25 Apr 2018 13:05:11 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Johan Hovold <johan@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andreas Kemnade <andreas@...nade.info>,
        Arnd Bergmann <arnd@...db.de>,
        "H . Nikolaus Schaller" <hns@...delico.com>,
        Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 3/7] gnss: add generic serial driver

On Wed, Apr 25, 2018 at 11:00:31AM +0200, Greg Kroah-Hartman wrote:
> On Tue, Apr 24, 2018 at 06:34:54PM +0200, Johan Hovold wrote:
> > +static inline void *gnss_serial_get_drvdata(struct gnss_serial *gserial)
> > +{
> > +	return &gserial[1];
> > +}
> 
> Oh that's the best hack I have seen in a long time.  I need to remember
> that one for next time.
> 
> Anyway, in reading this driver, I don't think the module reference
> counting is being handled here, so you might want to add that to the
> gnss core to keep things from going south if modules are unloaded.

As I just mentioned in my reply to your comment about module references
in core, I think I got this covered through the hotplug support. Devices
can go away at anytime, including through a module unload.

Thanks,
Johan